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Citellus matachicensis

Osteichthyes - Rodentia - Sciuridae

Taxonomy
Citellus matachicensis was named by Wilson (1949). Its type specimen is LACM (CIT) 3551, a partial skeleton (Nearly complete skull, mandible, and partial skeleton), and it is a 3D body fossil. Its type locality is Matachic, which is in a Hemphillian terrestrial horizon in Mexico.

It was recombined as Spermophilus matachicensis by Hemming (1956), Hall and Kelson (1959), Shotwell (1968).

Sister species lacking formal opinion data
C. beecheyi, C. beecheyi, C. citelloides, C. major, C. parryi, C. polonicus, C. primigenius, C. spilosoma, C. superciliosus, C. tridecemlineatus, C. undulatus, C. xanthoprymnus, C. citelloides, C. superciliosus, C. undulatus
Entered
by J. Alroy on 2003-01-23; modified by J. Marcot on 2026-05-27

Synonymy list
YearName and author
1949Citellus matachicensis Wilson p. 171 figs. plate 2, figures ra-3a
1956Spermophilus matachicensis Hemming
1959Spermophilus matachicensis Hall and Kelson
1963Citellus matachicensis Black p. 217 figs. Plate 22, figure 3
1968Spermophilus matachicensis Shotwell

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
classOsteichthyes
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
—Amniota
subclassSynapsida
—Therapsida()
infraorderCynodontia()
RankNameAuthor
—Mammaliamorpha
—Mammaliaformes
classMammalia
—Cladotheria
—Zatheria
subclassTribosphenida()
subclassTheria
—Eutheria()
—Placentalia
—Boreoeutheria
—EuarchontogliresMurphy et al. 2001
—GliriformesWyss and Meng 1996
—Glires()
—Simplicidentata()
orderRodentia
superfamilySciuroidea
familySciuridae
tribeMarmotini
genusCitellusOken 1816
speciesmatachicensis

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

†Citellus matachicensis Wilson 1949
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Diagnosis
ReferenceDiagnosis
C. C. Black 1963Rostrum short, of nearly uniform width; zygomatic breadth relatively great; ectopterygoid plates well developed; mesostyles minute; cheek teeth high crowned but lophs and posterolophids low; metaconule on M3 small; posterlophids low.
Measurements
No measurements are available
Composition: phosphaticsubp
Environment: terrestrialsubc
Locomotion: actively mobilec
Life habit: scansorialf
Diet: granivoref
Diet 2: frugivoref
Reproduction: viviparoussubc
Created: 2005-06-08 10:11:09
Modified: 2005-08-26 13:04:24
Source: f = family, subc = subclass, c = class, subp = subphylum
References: Nowak 1991, Hendy et al. 2009, Carroll 1988, Lillegraven 1979, Ji et al. 2002

Age range: base of the Late/Upper Hemphillian to the top of the Blancan or 9.40000 to 1.40000 Ma

Collections (3 total)


Time interval Ma Country or state Original ID and collection number
Late/Upper Hemphillian9.4 - 4.7Mexico (Chihuahua) Spermophilus matachicensis (type locality: 18734) Spermophilus sp. (18755)
Blancan4.7 - 1.4Mexico (Guanajuato) Spermophilus sp. (20077)